Referral Contests 2 by Siropu

Премиум Плагин 2.х.х Referral Contests 2 by Siropu 2.1.6

Referrer field issue with unconfirmed users, setting referrer twice.
Admin user editing issue with referrer field.
Added user option (permission based) to create invitations manually.
Added "Invitations per month" user group permission.
Users with unconfirmed accounts won't count as referrals until they confirm their account.
When creating invitations as admin for a different user, that user will get an alert about it.

Bugs Fixed
Integration issue with DB Tech Credits latest version.
Issue with sending invitations in some situations.
Issue with sending admin alerts when a referred user required moderator approval.
Uninstalling not removing custom user field.
Other code issues.